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Magnetic Properties of Low-Ca Fly Ash: A Rapid Tool for Fe-Assessment and a Survey for Potentially Hazardous Elements

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Abstract

Between 20 and 50 per cent of the total iron in low-Ca fly ashes resides in low-substitution magnetite spinel with Curie temperatures in between 565 and 590°C. A TEM study reveals that the spinel consists of aggregates of closely spaced spherules of 10–30 nm in diameter, which is in complete agreement with rock magnetic determinations. The low-field magnetic susceptibility correlates extremely well with total iron and fairly well with specific heavy metals. Measurement of the magnetic susceptibility may serve as a rapid tool for the evaluation of the speciation of these heavy metals in fly ash.

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Acknowledgement

The Louis Néel laboratory (CNRS, Grenoble, France) made available its ballistic magnetometer for the hysteresis measurements at room temperature and at 77 K. The measurements were supervised by G. Fillion. This study was supported by a grant from the Royal Netherlands Academy of Sciences and Arts to MJD and a grant from NOVEM (The Netherlands Society for Energy and Environment; contract no 11238.p117) to HSP.

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Authors and Affiliations

  1. Paleomagnetic Laboratory ‘Fort Hoofddijk’, Institute for Earth Sciences, University of Utrecht, Budapestlaan 17, 3584 CD, Utrecht, Netherlands

    M.J. Dekkers

  2. Faculty of Civil Engineering, Department of Mechanics and Constructions, Section Materials Science, Delft Technical University, Stevinweg 1, P.O. Box 5048, 2628 CN, Delft, Netherlands

    H.S. Pietersen

Authors
  1. M.J. Dekkers
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  2. H.S. Pietersen
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Dekkers, M., Pietersen, H. Magnetic Properties of Low-Ca Fly Ash: A Rapid Tool for Fe-Assessment and a Survey for Potentially Hazardous Elements. MRS Online Proceedings Library 245, 37–47 (1991). https://doi.org/10.1557/PROC-245-37

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  • DOI: https://doi.org/10.1557/PROC-245-37

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